XML 15 R1.htm IDEA: XBRL DOCUMENT v3.22.4
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2022
Feb. 13, 2023
Jun. 30, 2022
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol ALTR    
Entity Registrant Name ALTAIR ENGINEERING INC.    
Entity Central Index Key 0001701732    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2.7
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity File Number 001-38263    
Entity Tax Identification Number 38-2591828    
Entity Address, Address Line One 1820 East Big Beaver Road    
Entity Address, City or Town Troy    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48083    
City Area Code 248    
Local Phone Number 614-2400    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Class A Common Stock $0.0001 par value per share    
Security Exchange Name NASDAQ    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Detroit, Michigan    
Documents Incorporated by Reference

Portions of the registrant’s Proxy Statement relating to the 2023 Annual Meeting of Stockholders, scheduled to be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2022, are incorporated by reference into Part III of this Annual Report on Form 10-K.

   
Class A Common Stock [Member]      
Document And Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   52,393,695  
Class B Common Stock [Member]      
Document And Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   27,674,574